whitener

noun
whit·​en·​er | \ˈhwīt-nər, ˈwīt-;ˈhwī-tᵊn-ər, ˈwī-\

Definition of whitener 

: one that whitens specifically : an agent (such as a bleach) used to impart whiteness to something

First Known Use of whitener

1540, in the meaning defined above

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The first known use of whitener was in 1540

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